Water heater (boiler) not heating water at night but it does during the day

[piokowalski]

I have been having issues with my Boiler (water heater) - Horstmann Quartz e7.

It has been working perfectly for 3.5 years (since I moved in to my place). Suddenly it stopped heating up water at night.

It does not heat water at night even though it seems that the timer works at night. To make it clearer:
- I wake up in the morning and water is cold (it has been happening for 2 weeks) - and I (and my flatmate says the same) did not change anything about settings (anyways - there is nothing to change - it is very simple).
- but the boiler itself is working as when i choose the 'booster' option after 20 min water is hot/warm.

There is something wrong with night clock (timer) - but I checked once and it seems like it is working at night but still water is cold. And of course it is turned on - 'timed'.

Please help. Thanks!

 

[The Ghost]

Maybe the fuse/mcb on the off peak has tripped ? Does the off peak light come on at night ?

 

[7029 dave]

Element maybe shot.?

 

[The Ghost]

Element maybe shot.?

cant be boost works

 

[sparkey999999]

cant be boost works

could be, different element for boost

 

[The Ghost]

Aha good point

 

[7029 dave]

Boost could be on 24hrs.?

 

[Silly Sausage]

http://www.horstmann.co.uk/files/2713/9867/2126/user_guide_economy_7_quartz_-_E7Q.pdf

Possibly two elements.
You could be both right.

 

[The Ghost]

Yeh It would be on 24 hrs I reckon. But double elements are not uncommon I agree. If the element has gone then it may still have tripped the Off peak supply and it seems the first check to establish that no ?

 

[7029 dave]

could be, different element for boost

Think its on 24hrs, not on e7 for boost.

 

[The Ghost]

Defo agree boost is on 24 hrs. And thinking about it, its gotta be two elements as I cant see attaching two different supplies to one element theres hardly enough room for one supply.
And as it says in the instructions the white dot should either be lined up with winter time or summer time and it is neither, wonder if that has any bearing ?

 

[7029 dave]

A normal reading between L N on an element will read 17 to 19 ohms.

 

[piokowalski]

Thank you a lot for your answers! What should I do now? Probably call a repairman?
btw - I ll try to check once more if it works at night (light on) but water is not warm.

 

[Richard Burns]

If your timer is working and it is set to timed then there are various points of possible failure, the most likely one being a problem causing the element to overheat and operate the safety reset. Element failure is also likely.
You should have a set up something like this

The off peak side is the problem.
Make sure the MCB is on (up), if it resets but trips overnight then the element is most likely shot.
Make sure the isolator switch is on.
With the power to the immersion off, check if the overheat reset has tripped
if you have one it will be either on the thermostat or the element boss. If this has tripped there may well be a significant problem but it is worth resetting it once and seeing if it works again, if on the second night you have no hot water and the reset has tripped then the element will need to be replaced.

 

[piokowalski]

Thanks again for your answer.

Hm, i am not sure what I should check... 2 electricity swichers are on (red light is on - attachment ending 144223) but the rest not sure where I should check...
I attach 3 pictures, maybe it helps. If not I will ask for a repairman to come over...

By the way - is it possible it is not working at night because somebody changed some settings or switched something off?

Thanks!